Why Is Insulation Required on the Range Hood Vent Pipe?

Insulating duct pipes for range hoods prevents condensation from forming and dripping back into the hood, which can occur when cooler air passes over warm uninsulated ducting. Either applying insulation to the pipes or burying them in existing insulation is appropriate, based on the technology available as of 2015.

Steps to improve range hood effectiveness include venting to the outdoors if possible, installing the hood within 24 inches of the heating surface, using the back burners and turning the unit on before turning on the stove.